JPH08298077A - Electron gun for cathode-ray tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify a structure and facilitate the assembly, and to curtail manufacturing cost by providing a support bracket having a plurality of insertion holes, case members inserted in the insertion holes in a slidable state, and insulation materials. SOLUTION: A support bracket 12 is fixed on the inside surface of a first electrode G1, and a case member 14 having a negative electrode 10 held in a fixed state by an insulation material 16 filled in the interior is inserted in an insertion hole 12a of the bracket 12. Next, the bracket 12 and a lower side of the member 14 are jointed to each other by a means such as welding. After that, insertion and assembly of a negative electrode structure body is finished by fixing an auxiliary bracket 18 thereto. At this time, the negative electrode 10 is supported by the insulation material 16 filled in the member 14, and the member 14 is slidingly inserted into and welded onto the hole 12a, and a space between the negative electrode 10 and the electrode G1 becomes adjustable to an appropriate space. Thereby, the number of component items is lessened and assembly is facilitated, and therefore productivity is increased and manufacturing cost can be markedly curtailed.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an electron gun for a cathode ray tube. The present invention particularly relates to an electron gun for a cathode ray tube in which a plurality of electron guns for accelerating and focusing control of thermoelectrons emitted from a cathode are sequentially arranged.

[0002]

2. Description of the Related Art Generally, as shown in FIG. 1, an electron gun mounted in a neck portion of a cathode ray tube to emit red, green, and blue electron beams includes a cathode 1 that emits thermoelectrons and the cathode 1.
A plurality of first to sixth electrodes G1, G2, G3, G4, G for accelerating, focusing and controlling the thermoelectrons emitted from the
5 and G6 are sequentially arranged and welded at a predetermined interval in a pair of bead classes 2 to maintain a fixed state, and a shield cup 3 is fixedly installed on the upper side of the bead class 2. .

Further, two electron lenses are formed by applying the same voltage to the third electrode G3 and the fifth electrode G5 and to the fourth electrode G4 and the sixth electrode G6, respectively, to focus the electron beam. Will act, but cathode 1
The electron beam emitted from the first and second electrodes G
The second and third electrodes G after being accelerated by 1, G2
2 and G3 are pre-focused, then sequentially focused by the fourth and fifth electrodes G4 and G5 and the fifth and sixth electrodes G5 and G6, and then scanned as a beam having a minimum cross-sectional area on the phosphor screen. Is done.

By the way, in such an electron gun, the cathode is
It is well known that not only should it be fixed in the correct position, but it should be insulated from other electrodes.

Prior Art 1 FIGS. 2 and 3 are views showing an example of a cathode support applied to a conventional electron gun. Here, a plurality of cathode structures including the cathode 1, the case member 5 and the insulating material 4 filled between the cathode 1 and the case member 5 are inserted inside the first electrode G1.

Prior Art 2 Meanwhile, FIGS. 4 and 5 show another example of a cathode support applied to a conventional electron gun. Here, the outer case 5a, the outer insulating material 4a, and the plurality of first electrodes G1 are provided inside the first electrode G1.
And an inner support 5b is fixedly provided. In addition, inside the first inner case 5b, the cathode 1, the inner insulating material 4b, and the second inner case member 5c are provided.
1 has a structure in which one cathode structure is inserted.

[0007]

However, in the structure of the prior art 1, the case member 5 is provided inside the first electrode G1.
However, there is a problem in that, when the chips are fixed by means such as welding, the defective rate increases due to changes in the positions and intervals of other electrodes.

On the other hand, in the structure of the prior art 2, it is difficult to join the first inner case 5b into the outer insulating material 4a to form the insulating support, and as a result, the manufacturing cost is increased. Overall, there were many parts, and there were problems such as an increase in assembly man-hours and manufacturing costs. Further, since the insulating material is relatively soft, there is a possibility that the positions and intervals of the respective members may undesirably fluctuate during assembly.

Therefore, the present invention has been made to solve the above-mentioned various problems, and an object thereof is to provide an electron gun for a cathode ray tube which has a simple structure, is easy to assemble, and can significantly reduce the manufacturing cost. To do.

[0010]

In order to achieve the above object, an electron gun for a cathode ray tube according to the present invention is an electron gun for a cathode ray tube in which a plurality of electron guns for accelerating and focusing control of thermoelectrons emitted from a cathode are sequentially arranged. A support bracket having a plurality of insertion holes fixed to the inside of the first electrode in the gun;
A case member is slidably inserted into the insertion hole, and an insulating material is filled between the case member and a cathode provided inside the case member.

In one aspect of the present invention, an auxiliary bracket is fixedly provided under the support bracket and the case member. In one aspect of the invention, the support bracket is made of a metal material.

As an example of the assembling work in this configuration,
First, a support bracket is fixedly installed inside the first electrode. Then, slide the case member into the insertion hole of the support bracket and insert it. Since the inside of the case member is filled with the insulating material and the cathode is provided therein, the work is completed only by this.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment according to the present invention will be described in detail below with reference to FIGS. 6 and 7.

In FIGS. 6 and 7, 10 indicates a cathode which emits thermoelectrons upon heating.

The cathode 10 is fixed to the inside of the first electrode G1. The metal support bracket 12 has a plurality of insertion holes 12a formed in the inner surface of the first electrode G1.
Is fixedly installed, and the cathode 10, in the insertion hole 12a,
A cathode structure including the case member 14 and the insulating material 16 filled between them is fixed.

Further, an auxiliary bracket 18 is joined to the lower side of the support bracket 12 to support the lower end of the cathode structure, thereby adjusting the distance between the cathodes 10 and parallelism, and the hole of the first electrode G1. The center of the cathode 10 can be joined precisely.

Next, the operation and effect relating to the assembling of the electron gun for a cathode ray tube according to the embodiment thus constructed will be described.

First, a support bracket 12 is fixedly mounted on the inner surface of the first electrode G1, and a cathode fixed in an insertion hole 12a of the support bracket 12 by an insulating material 16 filled inside. The case member 14 having 10 is inserted. Then, the lower sides of the support bracket 12 and the case member 14 are joined to each other by means such as welding.
Further after this, the support bracket 12 and the case member 1
The auxiliary bracket 18 is fixed to the lower side of the No. 4 by means such as welding, and the insertion and assembly of the cathode structure are completed.

At this time, the cathode 10 is attached to the case member 14
The case member 14, which is supported by the insulating material 16 filled in the inside thereof and supports the whole, is the support bracket 1.
It is inserted and welded while sliding in the second insertion hole 12a, so that the distance between the cathode 10 and the first electrode can be adjusted to an appropriate distance.

[0020]

As described above, according to the electron gun for a cathode ray tube of the present invention, the number of constituent parts is very small. In addition, productivity is improved because the assembly is easy. Further, since the distance between the cathode and the electrode can be easily adjusted, the defect rate can be reduced and the manufacturing cost can be remarkably reduced. In addition to these, by providing the support bracket, the amount of the insulating material can be reduced as compared with the related art.

When the auxiliary bracket is fixedly installed on the lower side of the support bracket and the case member, the positioning of each member becomes more accurate and reliable, and the fixing strength between each member also increases.

When the support bracket is made of a metal material, the metal material is generally less expensive than the insulating material, so that the cost of the entire electron gun for a cathode ray tube can be reduced. In this way, various excellent advantages are provided.

[Brief description of drawings]

FIG. 1 is a side sectional view showing an ordinary electron gun.

FIG. 2 is a partial cross-sectional view showing an example of a cathode support applied to a conventional electron gun.

3 is a cross-sectional view taken along the line II of FIG.

FIG. 4 is a partial sectional view showing an example of a cathode support applied to a conventional electron gun.

5 is a cross-sectional view taken along line II-II of FIG.

FIG. 6 is a partial cross-sectional view showing an electron gun according to an embodiment of the present invention.

7 is a cross-sectional view taken along the line III-III in FIG.

[Explanation of symbols]

10 cathode, 12 support bracket, 12a insertion hole,
14 case member, 16 insulating material, 18 auxiliary bracket, G1 1st electrode.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kim Chang Seob of South Korea Kyun Kido Suwon City Janggang Wasea 1 Dong 106-1 (72) Inventor Jun Bon Woo South Korea Seoul Dobong Soo 1 Dong 483-16

Claims (3)

[Claims] 1. An electron gun for a cathode ray tube, in which a plurality of electron guns for accelerating and focusing control of thermoelectrons emitted from a cathode are sequentially arranged, a support having a plurality of insertion holes fixed inside a first electrode. A bracket; a case member slidably inserted into the insertion hole; and an insulating material filled between the case member and a cathode provided inside the case member. Electron gun for cathode ray tube. 2. The electron gun for a cathode ray tube according to claim 1, wherein an auxiliary bracket is fixedly provided under the support bracket and the case member. 3. The electron gun for a cathode ray tube according to claim 1, wherein the support bracket is made of a metal material.